You're in line at the coffee shop, where it's easy to tune everyone out. But, today, you decide to pick up the tab for the person behind you. How might a small act like this influence your mood later today, tonight or throughout this week?

Can little actions bring big joy? Researchers find ‘micro-acts’ can boost well-being
A new citizen-scientist research project aims to test whether daily moments of awe, kindness and gratitude can make a real impact. Early results are promising. And it’s not too late to join the study.